Also, what factor determines the distance that the radio can be heard? Voltage, Current, or Power? My output right now is about 1Vpp. Current in nanoamps I think but don't have an accurate measurement for that. I'm running it off a 9V so I cant see the voltage going more than 3or4Vpp but I can probably up the current.

The lengt of the antenna for low frequency is LONG. However if you cut it to the right lenght you may get an additional benefit. Like all antenna at some lenght no matter at what power the the emission is zero just like 120 at some point the power is zero. keep that in mind when cutting the lenght.